399307 has 4 divisors (see below), whose sum is σ = 400680. Its totient is φ = 397936.

The previous prime is 399283. The next prime is 399353. The reversal of 399307 is 703993.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 703993 = 337 ⋅2089.

It is a cyclic number.

It is not a de Polignac number, because 399307 - 2¹¹ = 397259 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (100170).

2³⁹⁹³⁰⁷ is an apocalyptic number.

399307 is a deficient number, since it is larger than the sum of its proper divisors (1373).

399307 is an equidigital number, since it uses as much as digits as its factorization.

399307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372.

The product of its (nonzero) digits is 5103, while the sum is 31.

The square root of 399307 is about 631.9074299294. The cubic root of 399307 is about 73.6380548124.

The spelling of 399307 in words is "three hundred ninety-nine thousand, three hundred seven".